Bunch builder



Sept.

' J, G. BAKER BUNdI-I BUILDER Filed Jan. 5, 1925 3 Sheets-Sheet 1 INVENTOR.

A TTORNEY.

Sept. 1, 1925.

. 1,551,782 J. G. BAKER BUNCH BUILDER Filed Jan. 15. 19 5 She. t t 2 [f h v 'v A 6 2/ 4 46 avy] (7 fd 4f A TTORNE Y.

Sept. 1, 1925.

J. G. BAKER BUNCH BUILDER Filed Jan. 15, 1925 3 Sheets-Sheet 3 INVENTOR.

ATTORNEY.

L V I q cent Ot'thm-ring-raiIerereduced or j.de

Patented Sept. 1925. y

JOHN" G; BAK'ER,:JOFQAMSTERDAM, 1 T.EW-

YORK, Ass-xenon 0F ONE-HALF'LTO PEA-RI HBUFLLISQIOF AMSTERDAM'jFNEW YORK.

- BUNCH BUILDER.

'A nqauon led January To all fwho-m'it mag/concern. Y I

'1 Be it fknoWn 'thatI, JOHN G.- BAKER a citizen 3 of, the s United; States of America, by j and a resident ofArnsterdem, in the county 5101': Montgomer j and; State of New York,

'have invented a] ne and useful Bunch Builder,of whichjthefollowing is a specification. Y, e j My inventionjre'lates to gimprovements 1n lQ 'buildero a'rms for spinning frames, and consistsessentiellylof a cam-operated bunch} builder atta hm nt" for a b'uildererm, which attachment comprises a ,cz rrier 'p'ivotally .[ConnectedWiththe builder "arm, and pro- 15" yided with ecfem rolludjustable means for v saidncar'r er,:flfldftrlp 'niechanism'for said v the agency of a feeler,i*wh ch' latter is m qcaifrir saidj trip Qnrechanismincluding a [cam ,o'n th'e' builder-arm; Worm shaft, "and 2L eam arrangedgto' act on" said roll, together 2o"With'suchothenparts end members as may }be,,;nece's sar yfor desirable in order to render I the, bunch builder complete and serv ceable J .in every respect; elljas" hereinafter set forth.

g The builder' ar'm, with-which my bunch builder is ;-fconnec'ted and used, and the closely i associated parts and members "or mechanisms, byjmeans of which ,the ring. rail is, caused to: i'iseffend jfaillf and to make combined ,iutithj the new elements that they may be saidto constitute parts of the "bunch. builder itself jThe'flbunCh' builder cuts bui d a m, .du in'gsth i ini i l 9 @first P e 'riodfof jthe opefra'tion' of s giid jiimf 1n con.- sequence :of this reduction of? the oscillat- I my movement 'of the builder er n, bo tlifthef Q up (and down movement and progressive as- I cz 'eesedin extent. L y H e My invention "isiusedffin connection with filling mind, where the ya'rn 'is wound on a bobbin or, filling quillj'infshort layers each being v inches. in lengthgbeg'inning, near the bottom. of the,quillandizipproaching the top, but

. without changing *thelfengfli of the layer.

Yarn is Wound on the fb'obbin in this menshuttle;

, ,nen for {use in a shuttle in aje loom,v-a,nd so that the, yarn can be pulled ofi of the, end it of the ,bobbin; for iney. idirection 1'3'ere11e1 I A \rith the axisofitliefsame;

, J went t ya n 11 'progressivefa'sjcent; are retained. As a 3Y0 down or reduces 'the stroke or throw of the ap 'ar'oxiniately one "and ,one helf a ,fi ungfiiobbi 15, 1925. 'seriai; No; 2,524.

in a shuttle runs'out andjthe loom thereafter makes one or more picks, a mark is left in the cloth, consequently it is necessary thatthe bobbin, before it becomes .en-

tirely 'empty, be removed fromfthe shuttle and replaced with a full bobbin, andthis must be done ith as; little Waste'of yarn The primary object of my iny'en'tion is, therefore to' provide in connectioii or combination with. a. builder arm mechanism "for reducing to the minimum (the aforesaid" Waste. Y J i On a loom 'is a 'dQVi'C'ekIiOWHa'S a ."bat 'tery which automatically changes the bobbin in the shuttle between picksof the 100m. This device is caused 'to operatethrough adjusted to act Whenjthere'isno longer sufiicient yarnjon the bobbinin the shuttle to supportit. It is evident that thisfeeler must be set to ELCtfhOWQVQI, while there is ,still soine yarn lefton the bobbin, in order to compensate for the variation in the sizes of bobbins, a ndyfurthermore, since the taper of.tl1e;yarn on the bobbin is ordinarily 1ong,jsaidfeeler mustrbe' set meet at '2;

point; some distance'above the bottomof the bobbin. It follows, therefore; that a consideraible amount ofyarn-"must be left on the bobbin when the latter is 5 knocked out ,oftheishuttle if all liability of leaving shuttle marks; isfto be avoided. 'This yarnis stripped from the'bobbin andbecomes thread aste which is relatively 'Velueless. By; building up the yarn; quicklyto an. appreciable thickness .With' a short stroke or layer, '1 do with my. bunch builder, ebun ch of sufi icientsize to hold up the ,feeler is madej wi th et'fleasts' one-half of the" amount ofyarn required; heretofore, Furthermore, since the stroke Withv .the builder ermqis; greatly reduced, the amount .of letofflofthe builder-arm chain is correspondingly reduced, and this let-oificontrolsthe taper of the .yarn on the'bobbin, and produces abunch which is'veIfy-obtuse "at the bottom. "In consequencefof j this. the

feeler' can beset nearer the bottom of the bobbin, and 'thereis much'less yarn left on the bobbin -Wh'en it iisjf'knockedj' fromjthe sucl1 taperibuilt up to v aconsiderable size before the ring-rail is permitted to make its regular stroke and let-off, with the result that space on the bobbin is completely, instead of only partially as ordinarily, filled. Thus more yarn is wound on the same bobbin and the spinning-frame does not need to be stopped so often to doll or change bobbins; furthermore, the bobbins run longer in the loom, less bobbins are knocked out of the loom in a given time, and there is less waste of yarn. Herein, then, is found another object of my invention.

Further objects are to provide a bunch builder which can be combined, requiring but very little change, with a builder arm of the ordinary type, is comparatively inexpensive and simple both in construction and operation, and is automatic in both the tripping and resetting operations.

lVith this bunch builder the bunch is tightly wound on the bobbin, because the ring-rail is not permitted to step during the winding operation, and consequently the yarn does not rope off, as so frequently is the case when other types of bunch builders are employed.

From the foregoing it is seen that this bunch builder effects a saving of approximately one-half of the bunch as ordinarily formed on the bobbin, and that gain results from the increase in time between dotiing, whereby the spinning-fran'ie is in productive use during longer periods, and there is a saving in time of the operators.

Gther objects and advantages will appear in the course of the following description.

I attain the objects and secure the vantages of my invention by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a front side elevation of the head-end portion of a spinning-frame, such portion extending high enough to include spring-rail and roller beam on that side, and having incorporated therewith a bunch builder which embodies a practical form of my invention; Fig. 2, a transverse vertical section through the aforesaid portion of the spinningframe, taken on lines 22, looking in the direction of the associated arrow, in Fig. 1', Fig. 3, an enlarged side elevation of a bobbin with a bunch built thereon with the aid of said bunch builder; Fig. 4, a side elevation of said bobbin when completely wound or full; Fig. 5, an enlarged side elevation of a bobbin having the yarn wound thereon without the aid of said bunch builder; Fig. 6, .a side elevation of said lastnamcd bobbin showing the amount of waste yarn left at the time the bobbin is knocked out of the shuttle; Fig. 7, an enlarged top plan of the builder arm and bunch builder, without the cams and with parts broken away; Fig. 8, an enlarged end elevation of the bunchbuilder carrier; Fig. .9, an enlarged side elevation of the bunch builder, showing'the same after being tripped, and, Fig. 10, an enlarged side elevation of the adjusting arm of the bunch builder.

Similar reference characters designate similar parts throughout the several views.

In describing the old parts of the spinhing-frame, the description will generally be confined to one ring-rail and one bobbin.

In the general views only so much of the spinning-frame is illustrated as is necessary to an understanding of the construction and, operation of my bunch builder. Only one bobbin is shown in place in the first view, and the lower portions of a bobbin on each side in Fig. 2. In practice, there are, of course, a large number of bobbins on each side of the spinning-frame.

I will first briefly describe the old parts and members, including the builder arm, of the spinning-frame, illustrated in connection herewith.

The supporting parts of the spinningframe which appear comprise a vertical head 1, a sampson or center leg 3, longitudinallye:\:tending spindle rails 4-,, a cross girt 5, and a roller beam 6. 'There is a spindle rail on each side of the spinning frame, and supported on each of these rails is a base 7 ot a spindle (not shown) for a filling quill or bobbin 8, and provided with a pulley 10 which is driven in the usual manner by means of a belt 11 from a cylinder 12. One end of the cylinder 12 is supported at 13 from the head 1. A. ring-rail is represented at 1 1 on each side of the spinning-frame. Each bobbin 8 extends through one of the r ng-rails 14, and through a spinning-ring 15 on said ring-rail. The thread or yarn. repre sented at 16 in Fig. 1. passes downwardly, from the drawingrolls (not shown), of the spinning-frame, through suitable guides to the bobbin 8 in that view. Some of the parts and members thus far described are more or less fragmentary.

A bearing bracket 17 depends from the cross girt and a shaft 18 is journaled in the head 1 and said bracket. and has mounted thereon and secured thereto a builder cam 19. A builder arm is represented at 20, and this is mounted on a. rock-shatt- 21 which is journaled in the head 1 and a bearing bracket 22 that also depends from the girt 5. The bracket 22 has an adjustable con-- nection with the girt 5 longitudinally thereof for the purpose of balancing the stroke of the builder arm, or evening the amount of time which it takes for said arm to make the up and down portions of the complete stroke of the same.

The ring-rails 14 are arranged in sections in the customary manner, and each of such sections is supported on lift rods 23, there being two of such rods or each section on each side of the machine, although but one its a e p i jo al y cQ ne'cte QWi h,t ff e terminal of a lijft leyerjae, ;;ind" saidlefver at the opposite end is .lndimtedon and, se- 5 lcured to a ,roek -jshaftg25svhichlis journ aled in a vbracket;26 thatdepends from e ach of -the'spin dlerails 4:. Anextension 27- from the lever,.2.4 isprovidedjwith aiweight '28 which ,is counterbalance for the ring-rail 4? An ar 29s es i mith r ck-shaft 2 is provided on topfwithg a sector 30, and eons'titutes a part of the let-"off 'or lifting mechanism ,fontl e ring-rail. "AV chainjSl hasone builder arm 20;, through ltheimedinm offa shortlength Ioffchain,34 and, other pants and imeinbers presently to be I described. The

"thesectolf 30,. passes"0ver;a sheave 35'oarri'ed h y the 1 spindle rail j 4 and looated "above the builder, (arm .20. [The axisof "the sheave 35 V Li s at, ri ghbangles to: the longitudin al direction at the builder arm. The length'got' the 'strokelof the builder arm is regulated by'adj ustingi the chain-sector ar1n29 on the-rookshaft 25.,

f iQbviously; armQQO llated on, or ,Wl'th the roekjishaft 21 such oseillatory dnovementfmustgbe impartedito the wring-rail 714i; through; the medium" Of the chains 34;,and 31;,the seotor,3Qivand' arml29, the rook rshaft l25,,the, lever 94, and; the rod 23,. (there areIeotu'a-ll V0;levers .24 and mi f comment K32); w th? e QQ Qr 3O 1 eontrols ithe position ;from Whir'zh? .j t-hl ring efon weach; ringrrail 2' section; and stroll-levers or I arm o ee r si e 79f..th spini i gfiram are -eonneoted, by ,tiQflQ l's "a parent one of which is- .represe11ted M35. 7'

. indicated angst to aal'ug'j Qn'vthe front n n era lfl s .1 are-n gge ,z nd unde adjus able I v I rodes is;locatedhearth flea.

p As will hereinafter bejmadeplain the upvil mitt heLb ilderrerm- When forced fd w k-wardlrv atQthe time'fthe'fspinningftraine is Th .b il. v a I h ad I1 f mo 'e .shattlZlQ ndi e frQnt terminal secured at 32 to thesectorBQ, and e ,theother.terminal ,connectedIat 33 with the ohaiin .31,on its way from the ohain '34 to provided atthe inner or rear'terminal with "wheel is actuated in the-direotion tooause I rods 23I ,-f0r 'ea h,,,r grail) I ,The ad;

j ustment of the l ngth olfwthejehain 3,1 atits Pivot lyro c ed etthe.unp -fi rm ah,

; nd t e l wer @1 5 ;39 rse jvesgas (a 'stop itov a i 2 1 said amusement t th f h n 7 }on free.end thereofgis ar'ecess eOint-o which" ala 6L1. projeets. Loosely mount'ed on the v studfl ,i'se orm-Wheel A2,;said X OrmQ wheel 42 has" rigidly eonneoted I therewitlron tlfbutoutside' of the recess -10; a pulley 43.

*The lower' termin al oft/he ehain' t is secured to the-periphery of the pullev 43, and said oh'ain passes' upwardly from the right-hand side ots aid pulley-to be-attaeliedto the oh'ain' 31. A lug 44 extends into the recess from the back side thereof to form a=stop fora web or stop 450m the back side of the Worm-gear 4-2, so that the rotation of said worm gear and the pulley 4L3 islimi ted. On the underside ofthe arm20,' adjacent to the free end thereof; is a bearing-lug 46, and

a pawl-'51. The pawl 51 is pivo'tedut- 52 to the arm 50, and with its lower nd'en gages the l'EltQllBf-Wl166149. Thesdiree-tionof the ratchet- Wheel teeth-is such thatlheratehetrrheel 42 and pulley 43; to let ofior unwind ftlie" chain 3st from said p'u lleyl henQthe hmlderarnrswings upwardly, provided the Jet-0:5 arm he' heldat-the inner end and thereby reused to rock on its axis with the V 3upwardly-swingingbuilder arm. 1 The letoff ar1n 50 is providedwithjthe customary stops =9l- 9l to contact with-the: builder arm [and prevent said leftwfl arm from GSSUDP" ing'an inoperative'positionu As-sho n-in Fig. 7 there is a space ii -hetwe'en the inner-end portion of the let-oh arm 50end the pawl fil suoh spacclat Yhe inner-exidbeingdefined by :1 lug -54 atthe extreme inner and of sald arm. The rod' 38 passes throughtheispaoe '53, and-tho collars 39 are" above and helowvthesnaeedorming parts ofitl-le arm} 50' and pawl 5'1.

"By- -setting the upper Collar so that the pawl '51'encounters the $31118 during the upward movement of the builder arm 20 and before saidparn'i -arrives; at'the'end of ,1ts;up stroke;v sa dpawl s caused toimpart ,to the ratohet-wheel l-f) a nartial revolution and thusto" let the chain'- 3% the amount v I v a k fof'let-oif' dependingonthe-setting otsaid armflZOa ex e dsto er the ratchetheel and the? number of picks such setting'provides for; as-thechain 34L islet ofi 'ot the 'pullevfl-3; thelift ortake-up meeha- ,nisin"is-per1nitted V to carrv-the ring-rail 14 wardly again-itcarriss niihit tho flet oti thefrontside;and also niountedon the'stud Y 1 the shaft l1 and--WO1m 48; and the jwormv arm and the pawl 51, which latter rides idly over the ratchet-wheel 49 and takes position in readiness to let-ofif again upon the next upward swing of said builder arm.

Secured to the back side of the builder arm 20 is a bracket which forms two bearings 56 and 57 for a roll 58 that normally bears against the cam 19, being actuated toward the same by the weight 28 and the intervening parts and members. The cam 19 has three high and three low points, and is so shaped that it imparts to the arm 20, through the medium oi the roll 58, a slow downward movement and a quick upward movement, and causes said arm to be oscillated three times at each revolution of said cam. As the cam 19 is rotated and the arm 20 oscillated thereby, the ring-rail 14 is raised and lowered accordingly and the yarn 16 is wound on the bobbin 18 in the usual manner. Meanwhile or each time the roll 58 enters one of the depressions in the cam 19 and the arm 20 swings upwardly, the let-off mechanism operates and in turn causes the lifting mechanism to operate and elevate the ring-rails 14, again in the usual manner.

The setting of the let-off mechanism is accomplished by rotating the shaft 47 in the reverse direction until the stop 45 on the worm-wheel -42 encounters the stop 44 on the backside of the recess 40 in the arm 20. At this time the chain 34 is wound on the pulley 48, which is a part of or incidental to the dolfing operation. While the stop 45 is in contact with the stop 44, the let-01f arm 50 is rocked on the hub of the ratchet-wheel 49 to position the pawl 51 in proper relation to said ratchet-wheel, so that, when said arm and pawl encounter the upper collar 39, said pawl is held by said collar in active engagement with the ratchet wheel teeth and the continued upward movement of the builder arm causes the ratchet-wheel to be partially rotated. By this means and in this manner is imparted the movement necessary to lift the ring-rail 14 the required distance, because the pawl 51 actuates the ratchet-wheel 49 the number of teeth which corresponds with the distance that said ring-rail is to be elevated each time the let-oft operates.

In Fig. 5 is represented a "full bobbin as it would appear if wound in its entirety through the medium of the cam 19. It will be observed that the yarn on this bobbin has a long straight taper at the bottom. In Fig. 6 is shown the same bobbin from which the yarn has been unwound, leaving a bunch 59, which hunch is quite long and represents a large'amount of waste. In each of these views and in each of Figs. 3 and 4 a feeler is represented at 60. By greatly reducing the stroke of the builder arm 20, the amount of let-off of the chain 34, which let ofi' con trols the taper of the yarn on the bobbin, is reduced accordingly, which results in winding more yarn on the bobbin at the bottom, in producing a bunch with a very obtuse taper, and in rounding out the yarn at the bottom. 'Such being the case, the feeler can be set near the bottom of the bobbin, much nearer than formerly, and there will be much less yarn on the bobbin when it is knocked from the shuttle. a bunch is represented at 61 in Fig. 3, and the fully wound bobbin in Fig. 4. The dif terence in the amount of yarn on the bobbins illustrated in Figs. 4 and 5, where the feeler 60 contacts with the same in each case, clearly shows how much more yarn is wound on he first of these two bobbins.

To obtain with the mechanism hereinbetore described the results just pointed out, I make use of a bunching cam 62, which is mounted on and secured to the same shaft 18 with the builder cam 19, a cam 68 mounted on and secured to the worm-shaft 47, a carrier 64 for a roll 65, a latch 66, an adchain 69.

The cam 62 has three high points and six indentations with three arcs between said indentations, substantially as best shown in Fig. 9, and said cam is so arranged relative to the cam 19 that the high points of the former prevent the roll 58 from entering the depressions in the latter, and thereby materially limit the upward movement of the builder arm 20 during .the efiective operation of the bunch cam. By thus cutting down the movement of the arm 20, the

movement imparted to the ring-rail 14 by the lifting mechanism is correspondingly decreased.

A plate 70 is secured to the front side of the builder arm 20, and a bolt 71 extends forwardly through the bracket 55, said arm, and said plate, to receive on thefront terminal a washer 72 and a nut 73, with a sleeve 74 interposed between said plate and said washer. The carrier 64 is loosely mounted on the sleeve 74, and said carrier has a rear arm 7 5 and a front arm 7 6 which form bearings 77 for the trunnions of the roll 65. In the lower part of the arm is an arcuate slot 78 to receive a bolt 7 9, with a washer 8O interposed between said arm and the head of said bolt. The adjusting arm 67 is an arcuate member which has a lip 81 at the top for the attachment thereto of the lower end of the chain 69, a hook 82 on the outer edge adjacent to the top thereof, and a forwardly-extending lug 83 at the bottom to receive an adjusting screw or bolt 84. There is an opening 85 tapped into the arm 67 to receive the bolt 79. The spring 68 has one terminal attached at 86 to the outer edge of the arm 67. The latch 66 is pivoted at 87 to the front side and adjacent to the left- Suclr usting arm 67, a spring 68, and a resetting ha nd endzoif the plate'mnandis adapted to V have its: lupper end 'thriist 'benezith the hook position by'the springes 'ivhenfthe latter is brought into contact with the right-hand horizontal plene of'ltliei pivot 87', has'a pro jefctio-n 91; which is. thrust: into the path" of the cani 63, when 'saidlatch is acted'on'by the spring 68. Thenuppeneiid'ofthechain (39/is attached at :88't'to thelroller beam 6Q sliiQli 'in th efliain 69', to prevent saiclfchain fi'oin"interfering-"With the action vof the builder arm and parts"oai'ried thereby.a 1

' creas d,

downwaidl s fiir fas ithe lower oolhtr 39 will [permi' m1 siih 'lo'peiation takes the slI-ick out of" th'ef chain 69 and the latter swings ,the carrier. .64 nwardl from the I ies inl ig. 9 to' t'he position ivl h 'tfjo'eoupis-inthe other views The cariiffit 'i'n into. operative position ,,the roll- "comes into'contactfiiitli thefo ceiceuse he, wardly far jenou 1 aiin fisi-fsw qj g upward nan, theuoha'iii pa 1 t down 7 into supporting f relation with said from the -bunehing camesz, as'welles fioin thebuildericani '19, and. is neveri'permitte'd lLIi'Cliirigv "camlto enter the clepres-- siQ in seldb'uildfer cerfn. 1 The cain 62"'c' ujts down the oscillatory movement '1 0r the up ward stroke of "thfeja rm"zoe; and corresponds ingly decr ases? rise of the i'ingirail 1 L.

Itf-shouldlbe no d in pa sing. that, Iwith the" h gher; plane than gheron- 5s. The decrease,

in thenor i en onlthei spind'le' is anth m-Ha f fone- I w e v V ngrailcanses the. v bliiiel filftohe spun, onathe spindle the A tfthebottomv'so that s1; hereifihe'fore ex: lainedl 'lhe' i as long and; mildly Waste.

otl'i'eiwords,thebniiohing can: ni ust permit Thebunching-oam 62 continues to operate tliearni 20 to have the short upward strokes i1nj5artecl' thereto until the trip cam '63 -makes one revolution, When'said tri'p' cam act'ua'tes the latch 66 out'of engagement with the hook S2, and permits the carrier 64' to wing downwardly and carry the roll'j65 away from said bnnching Cain, aft'enwhich,

oruntiljsaid carrier is reset, the bunching vain continues to operate idly.

The chainfl69 must bethe, proper length to leave the amount of sleektherein necessary toip'i'e vent itf i'ominterfering with the operation (iftlie bunohbuilder, and to bring about the resetting'of the latter when the -a1m20 isforceddownwardly for dotting purposes. 7

The heig'ht' ofthe roll-65, When-said roll fis'in operative position, is regulated by means of theadjustnient afforded by the 'arm 67. Upon loosening the bolt 79, and if necessary the bolt 84, the arm (iTin'ay be adjusted longitudinall Withthe bolt 79in tlie'slot-TS; towhatever extentrnay be necessary, and} thensaid bolt 79 is retightenfe'd' j amlsai'd vb'olt 84flis screned a'galinst. the ad jaceiit; l edge the arm 75. The bolt 84 directly sup' aortsthe carrier fro nItheafinW assisted by the bolt79 'and't'he frict ionbe- Vtweenltlle ipsrts held together by said "last amount ofoscil-lation imparted by each cam beingapproxiniatelylthe same. As theaiin 20 rises eaehti'inqthe let-oil is operated to unwind.thechai'n 843end permit. the i'ing railfl l tonsoendsoas to rise and. fallthe neziti' tiinebetween two higher levels, but

very niuch lss of said chain is unwound than is 'tli e oasen'hen the builder arm is operated solely by: the: builder cam. lCon'sequently;by tlie tinie the coin Ggrtripsthe latch 60 to release the carrier 6%, the bunch 61 is Wound and theabot-toin of thewinding onvthe bobbin is filled in andl'built out'to tli'erequiredextent; i I v "The period of action of'the let-oil media-- men, is greater than one-half of the time which itJtfikesfor the builder arnitolniake jits;11psti'ol ::e; "Thus it appears that in re dimin'gjthefstroke of thebuilder arm with my bunch :bnil'clerf the amount of let-ofif is greatly reduced, but the bunching ean'i inust beso constructed .that eachrup stroke thereby permittedtothe builderarni is sufiicientlto produce laQl'etk of'. ofatlleast one tooth. n' l the builder arm to make a stroke of sufficient length to enable the let-01f to make at least one pick.

As soon as the carrier G L is released and swings down into its inactive position,-the builder cam 19 commences to actuate the builder arm in the natural way, and with and through said arm the let-off and the lifting mechanism, the latter then elevating the ring-rail 14: the full distance permitted by said let-off as and each time that the roll 58 enters one of the depressions in said cam.

As the end of the spinning operation, the machine is doffed, during which time the bunch builder is reset and the chain 34 is rewound on the pulley 13, the latter operation being performed by rotating the wormshaft in a reverse direction by means of a suitable tool applied thereto.

The chain 8% can not unwind or be unwound except by means of the let-off, due to the fact that the worm a8 is a single-lead worm and of the type known as self-locking, and to the friction between the parts. In order to increase the aforesaid friction a spiral-spring 89 is arranged on the shaft 47 between the hub of the ratchet-wheel 49 and the inner end of an enlargement of the bore in the bearing lug 46, as shown in Fig. 7. The low pressure angle of the worm and worm-gear and the friction between the parts prevent said worm-gear from moving said worm, but do not prevent the latter from readily moving the former.

More or less change in the shape, size, construction, and arrangement of some or all of the parts of this bunch builder may be made without departing from the spirit of my invention or exceeding the scope of what is claimed.

WVhat I claim as my invention, and desire to secure by Letters Patent, is r 1. In a bunch builder, a builder arm of a spinning-frame, said arm being provided with let-off mechanism which consists in part of a shaft, cam-operated means carried by said arm to reduce the movement thereof during a first period of its operation, and a trip device also carried by said arm for said means, and a cam on said shaft to operate said trip device.

2. In a bunch builder, a builder arm of a spinning-frame, said arm being provided with let-off mechanism which consists in part of a shaft, cam-operated means carried by said arm to reduce the movement thereof during a first period of its operation, and a trip device also carried by said arm for said means, a cam on said shaft to operate said trip device, and means automatically to reset said carrier when said arm is actuated downwardly for dofiing purposes.

3. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-ofi mechanism carried by said arm and provided with a rotary member, a carrier pivotally connected with said arm, a roll supported by said carrier, a cam, and oscillatory means carried by said arm and in the path of said rotary member normally to retain said carrier with said roll against said cam, the construction and arrangement of parts being such that said carrier is automatically released and permitted to remove the roll from contact with said cam, at the end of a predetermined number of oscillations of said arm.

4;. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-off mechanism carried by said arm and consisting in part of a shaft, a cam on said shaft, a carrier pivotally connected with said arm and provided with a roll, a second cam, and a latch pivotally connected with said arm and adapted to retain said carrier with its roll against said second cam, said latch being in the path of said first cam.

5. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-off mechanism carried by said arm and consisting in part of a shaft, a cam on said shaft, a carrier pivotally connected with said arm and provided with a roll, an arm adjustably connected with said carrier, and a latch adapted to engage said second-named arm and retain said carrier with its roll against said second cam, and to be operated by said first cam.

6. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-ofi' mechanism carried by said arm and consisting in part of a shaft, a cam on said shaft, a carrier pivotally connected with said arm and provided with a roll, an arm adjustably connected with said carrier and having a projection, a latch adapted to engage said projection and retain said carrier with its roll against said second cam, and to be operated by said first cam to disengage said projection and permit said carrier to swing downwardly and remove its roll from said second cam.

7. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-ofi' mechanism carried by said arm, a carrier pivotally connected with said arm and provided with a roll, a second cam, means to retain said carrier with its roll in contact with said second cam, means to trip said first-named means from said let-off mechanism, and a chain having one end attached to a fixed point and the other end connected with said carrier, whereby the latteris automatically reset when said arm is swung downwardly during the dofiing operation.

8. In a bunch builder, a cam-operated builder arm of a spinning-frame, let-off mechanism carried by said arm, a carrier pivotally connected with said arm and provided with a roll, an arm adjustably secured tit to said carrier, a cam, means to retain said carrier with its roll against said cam, means I to operate said first-named'means' from said let-off mechanism to permit said carrier to mechanism carried by said'arm and consisting in part of a shaft, a cam on said shaft, a second cam, a carrier plvotally connected with said arm and provided with a roll, an.

arm adjustably afiixed to saidcarrier and having a projection, a latch pivotally connected with said builder arm and adapted to engage said projection and retain said second-named arm with saidcarrier in position to retain said roll in contact'wlth said second cam, said latch having apart to extendinto I reset.

the path of said first cam, and a chain having one end attached to a fixed point and the other end attached to said second-named arm, and adapted automatically to swing upwardly and reset saidcarrier when said builder arm is swung downwardly for doth ing purposes. 7 x

10. The combination, in a device of the class described, with a ring-rail, lifting mechanism for saidring-rail, a cam-operated builder arm provided with let-off mechanism, and connections between said lifting mechanism and said let-off mechanism, of

cam-operated means carried by said arm to reduce the movement of said arm during a first period of its operation, means operated by said let-off mechanism to trip said firstnamed means, and means inactively connected with said first-named means until said builder arm is forced downwardly for dofiing purposes, when said I last-named means causes said first-named means to be JOHN G. BAKER. 

